CN113445024A - Preparation method of diamond coating, diamond coating and cutter - Google Patents
Preparation method of diamond coating, diamond coating and cutter Download PDFInfo
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0227—Pretreatment of the material to be coated by cleaning or etching
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
- C23C14/165—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon by cathodic sputtering
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0272—Deposition of sub-layers, e.g. to promote the adhesion of the main coating
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0272—Deposition of sub-layers, e.g. to promote the adhesion of the main coating
- C23C16/0281—Deposition of sub-layers, e.g. to promote the adhesion of the main coating of metallic sub-layers
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/26—Deposition of carbon only
- C23C16/27—Diamond only
- C23C16/274—Diamond only using microwave discharges
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
- C23C16/511—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using microwave discharges
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
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Abstract
The invention discloses a preparation method of a diamond coating, the diamond coating and a cutter, wherein the preparation method comprises the following steps: preparing a plurality of suspensions of nano-scale diamond particles, sequentially using the suspensions on the surface of the pretreated hard alloy substrate for crystal implantation according to the order of the particle sizes of the nano-diamond particles from large to small, and then growing diamond by a microwave chemical vapor deposition method to obtain the diamond coating. According to the invention, the nano diamond particles with various scales are used for planting crystals, and the surfactant is used for wetting and dispersing the diamond particles, so that the density of the diamond particles on the surface of the substrate in the crystal planting process can be greatly improved, the seed crystals can fully cover the surface of the substrate, the particle size on the surface is rich, the surface of a grown coating is smooth, and the coating has good hardness and wear resistance.
Description
Technical Field
The invention belongs to the field of diamond film growth, and particularly relates to a preparation method of a diamond coating, the diamond coating and a cutter.
Background
The hard alloy is a carbide (WC, TiC) alloy with good toughness, high hardness and good thermal stability, is widely applied to the aspects of wear resistance and low roughness processing, and is a good material of a cutter. With the increasing application of hard difficult-to-machine materials in the field of fine machining, such as automobiles, aerospace, integrated circuit boards and the like, the traditional hard alloy cutter is difficult to meet the machining precision requirement. How to strengthen the surface of the cutting tool to expand the application range is a common technical hotspot in the industry.
CVD diamond films have been widely used as ideal tool coatings and wear resistant materials because of their excellent properties of natural diamond, such as high hardness, low coefficient of friction, good impact toughness, simple process, and direct deposition on complex-shaped cemented carbide substrates to produce diamond coated tools. However, compared with developed countries, China has a large gap in the coating preparation of CVD diamond coated cutters and other technologies, and the diamond coated cutters in the current cutter market mainly comprise the well-known branded cutters of industrially developed countries such as America, Germany, Japan and the like, so that the development of the diamond coated cutter technology in China is seriously hindered. Therefore, the method has important significance for developing coating growth and mechanical property research on the diamond film deposited on the surface of the hard alloy substrate, and how to simply and efficiently prepare the diamond film with high growth quality and good mechanical property and friction property needs to be solved urgently.
The present invention has been made in view of the above-mentioned drawbacks and disadvantages of the prior art.
Disclosure of Invention
The invention aims to provide a preparation method of a high-quality diamond coating, which has smooth surface, low roughness and good mechanical property and friction property.
Another object of the present invention is to provide a tool made of cemented carbide having a surface coated with the diamond coating.
In order to achieve the above object, according to a first aspect, the present invention provides a method for preparing a diamond coating, the method comprising: preparing a plurality of suspensions of nano-scale diamond particles, sequentially using the suspensions on the surface of the pretreated hard alloy substrate for crystal implantation according to the order of the particle sizes of the nano-diamond particles from large to small, and then growing diamond by a microwave chemical vapor deposition method to obtain the diamond coating.
Further, a suspension of 3 kinds of the nano-scale diamond particles was used, in which the particle size of the nano-diamond particles was W0.25, W0.08 and W0.03 in this order from large to small, and accordingly, the number of times of seeding was 3 times.
Further, the suspension of nano-scale diamond particles comprises nano-scale diamond particles, acetone and a surfactant; wherein the mass concentration of the scale diamond particles is 3g/100ml-6g/100ml, and the mass concentration of the surfactant is 0.02% -0.1%.
Further, the surfactant is cetyltrimethylammonium bromide, which is used to wet and disperse each of the nano-scale diamond particles.
Further, the process of crystal implantation is as follows: placing the pretreated hard alloy matrix in the nano-scale diamond particle suspension for ultrasonic dispersion for 30-60 min; after the seeding, the residual nano-scale diamond particles are removed by sequentially cleaning the diamond particles with ethanol and acetone.
Further, the pre-processing comprises: cleaning the hard alloy matrix, performing Co removal treatment on the hard alloy matrix by an acid-base two-step method, and depositing a Ti transition layer on the surface of the hard alloy matrix by a magnetron sputtering method.
Further, the cleaned cemented carbide substrate comprises at least one of: ultrasonic cleaning with ethanol for 15 minutes, cleaning with deionized water for 5 minutes, cleaning with acetone for 15 minutes, cleaning with deionized water for 5 minutes, and cleaning with deionized water for 15 minutes; after cleaning, the mixture is put into ethanol for standby.
Further, the acid-base two-step Co removal treatmentThe method comprises the following steps: firstly, treating for 30 minutes by using an alkali solution, and then treating for 2-6 minutes by using an acid solution; the alkaline solution is a Murakami reagent, wherein the mass ratio of each component is K3Fe(CN)6:KOH:H2O1: 1: 10; the acid solution is a mixed acid, wherein the volume ratio of each component is H2SO4∶H2O2＝3:7。
Further, the preparation parameters of the Ti transition layer are as follows: background vacuum degree of 1-3 multiplied by 10 < -6 > torr, power of 70W, room temperature sputtering, sputtering pressure of 8-9 mtorr and sputtering time of 4 hours; the Ti layer has a thickness of 400-500 nm.
Further, the microwave chemical vapor deposition method comprises the following process parameters: the deposition temperature is 700-800 ℃, the deposition pressure is 3-5 kPa, the reaction gas is hydrogen and methane, the concentration of the methane is 5-15%, the nucleation time is 0.5 hour, the deposition time is 4 hours, and the thickness of the obtained diamond coating is 3-4 mu m.
In a second aspect, the present invention provides a diamond coating, which is prepared by the method for preparing a diamond coating according to any one of the above aspects.
In a third aspect, the invention provides a cemented carbide composite tool with a diamond coating, comprising a cemented carbide substrate, wherein the surface of the cemented carbide substrate is deposited with the diamond coating according to any one of the second aspect.
Compared with the prior art, the invention has the beneficial effects that:
the preparation method of the diamond coating is characterized in that the multi-scale seed crystals are sequentially carried out on the surface of a pretreated substrate from large to small, and wetting and dispersing effects of a surfactant on diamond nanoparticles in a suspension and the surface of the substrate are combined, so that multi-scale and high-density diamond particle nucleation is formed on the surface of the substrate, the surface of the grown diamond coating is smooth and low in roughness, and has excellent characteristics of high hardness and wear resistance, the surface nucleation density and size can be designed according to the size of the diamond nanoparticles, and the method is high in popularization. The hard alloy cutter deposited with the coating has long service life and good performance.
Drawings
FIG. 1 is a schematic diagram illustrating the effect of multi-scale seed crystal surface seeding according to one embodiment of the present invention;
FIG. 2 is a photograph of the surface of a diamond coating resulting from one embodiment of the method of the present invention, wherein FIG. 2(a) is a 3D image of the surface and FIGS. 2(b-D) are SEM photographs of the surface;
FIG. 3 is a graph of the coefficient of friction of a cemented carbide tool tested for diamond coating under a 5N load according to an embodiment of the tool of the present invention;
fig. 4 is a graph of the coefficient of friction of four comparative examples of the present invention testing diamond coatings under a 5N load, comparative example 1 corresponding to fig. 4(a), comparative example 2 corresponding to fig. 4(b), comparative example 3 corresponding to fig. 4(c), and comparative example 4 corresponding to fig. 4 (d).
Detailed Description
The technical solutions of the present invention will be described in further detail with reference to specific examples, but those skilled in the art will understand that the examples are given only for the purpose of illustrating the present invention and are not intended to limit the present invention.
The preparation method of the diamond coating comprises the following steps: and (3) sequentially carrying out crystal planting on the surface of the pretreated substrate by using diamond micropowder suspension with various scales according to the order of the particle sizes of the nano diamonds from large to small, wherein a surfactant is dispersed in the diamond micropowder suspension for crystal planting. And then growing diamond by a microwave chemical vapor deposition method to obtain the diamond coating and the hard alloy cutter covered with the diamond coating.
Specifically, the technical scheme of the invention comprises the following steps:
(1) pretreating a hard alloy substrate;
(2) carrying out multi-scale crystal planting on the surface of the pretreated hard alloy in turn according to the sizes of diamond particles, wherein a surfactant is dispersed in a diamond suspension for crystal planting; as shown in fig. 1, a multi-scale crystal growth representation is shown, and a typical crystal growth scheme is that a diamond particle suspension with the largest particle size is selected for crystal growth, a crystal nucleus with the size of a in fig. 1 is formed under the combined action of a surface dispersant and ultrasound, and after the crystal growth is finished, acetone and ethanol are used for cleaning; then, carrying out crystal planting on the diamond particle suspension liquid with the size of b, and cleaning after the crystal planting is finished; surface nucleation of a, b, c and other scales is completed in sequence, the nucleation is compact, and the distribution density is high.
The diamond particle size and number of species in the seeding process are not particularly limited for the purpose of forming nanocrystalline particles, and typical but non-limiting particle sizes are, for example, a of 0.25 μm, b of 0.08 μm, and c of 0.03 μm.
(3) And epitaxially growing a diamond coating by a microwave chemical vapor deposition method to obtain the diamond coating and the diamond coating/hard alloy cutter.
The embodiment is as follows:
the preparation process of the diamond coating and the hard alloy cutter covered with the diamond coating of the embodiment takes the YG6 cutter produced by the Lizhou hard alloy factory as a substrate, and specifically comprises the following steps:
(1) and (4) pretreating the hard alloy substrate.
a. And cleaning the hard alloy matrix. Ultrasonically cleaning with ethanol for 15 minutes, cleaning with deionized water for 5 minutes, cleaning with acetone for 15 minutes, cleaning with deionized water for 5 minutes, cleaning with deionized water for 15 minutes, placing in ethanol for later use, taking out and drying by blowing when in use.
b. Co removing treatment is carried out on the matrix by an acid-base two-step method. Treatment with Murakami reagent for 30min, where [ K3Fe(CN)6]:m(KOH):m(H2O) 1:1:10, and then treated with mixed acid for 4 minutes at a volume ratio v (H)2SO4)∶v(H2O2) 3: 7. After corrosion treatment, the steel plate is cleaned by ethanol and then dried.
c. And depositing a Ti transition layer on the surface of the substrate by a magnetron sputtering method. Background vacuum degree of 1X 10-6the torr is high, the power is 70W, sputtering is carried out at room temperature, the sputtering pressure is 8.5mtorr, and the sputtering time is 4 hours; the Ti layer is about 500nm thick.
(2) The surface of the pretreated hard alloy is subjected to multi-scale crystal planting in turn according to the size of diamond particles, and a surfactant is dispersed in a diamond suspension for crystal planting. The method comprises the following specific steps:
a. using acetone as a dispersion liquid, firstly preparing a diamond suspension by using W0.25 diamond micropowder according to 3g/100ml, dispersing the diamond micropowder by ultrasonic dispersion for 5 minutes, then adding 0.05 percent of hexadecyl trimethyl ammonium bromide as a surfactant to continue ultrasonic treatment for 5 minutes, then putting a corroded substrate material into the suspension, continuing ultrasonic treatment for 30 minutes, taking out the substrate after completion, respectively cleaning the substrate for ten minutes by acetone and ethanol, removing redundant micropowder on the surface, keeping the surface of the substrate clean, and preventing generation of diamond particles with low binding force.
b. Preparing diamond suspension by using acetone as a dispersion liquid and W0.08 diamond micro powder according to the proportion of 3g/100ml, ultrasonically dispersing for 5 minutes, adding 0.05 percent of hexadecyl trimethyl ammonium bromide as a surfactant, continuously ultrasonically treating for 5 minutes, then putting the substrate material subjected to primary crystal implantation into the suspension, continuously ultrasonically treating for 30 minutes, taking out the substrate after completion, respectively cleaning for ten minutes by using acetone and ethanol, removing the redundant micro powder on the surface, and keeping the surface of the substrate clean.
c. Taking acetone as a dispersion liquid, preparing diamond suspension by using W0.03 diamond micropowder according to the proportion of 3g/100ml, ultrasonically dispersing for 5 minutes, adding 0.05 percent of hexadecyl trimethyl ammonium bromide as a surfactant, continuing to ultrasonically treat for 5 minutes, then putting the base material subjected to crystal implantation in the previous time into the suspension, continuing to ultrasonically treat for 30 minutes, taking out the substrate after the ultrasonic dispersion is finished, respectively cleaning for ten minutes by using acetone and ethanol, removing the redundant micropowder on the surface, keeping the surface of the base clean, and finishing the crystal implantation process.
(3) The method comprises the following steps of epitaxially growing a diamond coating by a microwave chemical vapor deposition method to obtain the diamond coating and the diamond coating/hard alloy cutter, wherein the specific process parameters comprise: deposition temperature 750 deg.C, sample surface H2Cleaning for 10 minutes, bias voltage 200V, nucleation time 30 minutes, deposition pressure 4.5kPa, methane concentration 10%, deposition power deposition time 4 hours.
Comparative example 1:
the method for preparing the diamond coating of this comparative example is different from the examples in that:
only W0.25 diamond micropowder is used for crystal planting.
Comparative example 2:
the method for preparing the diamond coating of this comparative example is different from the examples in that:
only W0.08 diamond micropowder is used for crystal planting.
Comparative example 3:
the method for preparing the diamond coating of this comparative example is different from the examples in that:
only W0.03 diamond micropowder is used for crystal planting.
Comparative example 4:
the method for preparing the diamond coating of this comparative example is different from the examples in that:
the surface active agent cetyl trimethyl ammonium bromide is not added in the crystal planting process.
Comparative example 5:
the pretreated substrate YG6 was used as comparative example 5.
All samples prepared in the examples and the comparative examples are subjected to surface roughness, mechanical property and friction property tests, the surface roughness of all samples is characterized by adopting an Axio CSM700 Zeiss white light confocal microscope, and the measurement area is 2.5 to 105μm2. And (3) adopting a NanoTest Vantage system to represent the surface hardness (H) of the sample, wherein the indentation depth does not exceed 10% of the coating thickness, randomly selecting 5 points, and taking an average value. The friction force and the friction coefficient of the coating are measured in a reciprocating mode of a friction wear testing machine, the loading force is 5N, the frequency is 200Hz, the reciprocating length is 10mm, and the experimental testing time is 5 min. All results are shown in table 1.
TABLE 1 comparison of Properties, Performance parameters of all samples of examples and comparative examples
Table 1 lists the surface roughness Ra, the surface hardness H, and the friction coefficient of all the test portions of the samples, and the initial section of the friction coefficient is large because the surface roughness of the sample is large in the initial stage, and the sample enters the stabilization stage after entering the test wear-out portion. The diamond coating has better surface hardness and friction performance than all comparative examples, the surface hardness reaches 77Gpa which is the best value in all samples, the friction coefficient is less than 0.04, and the diamond coating has good wear resistance. It is understood from comparative examples 1 to 4 that, as the grain size of the diamond fine powder for crystal implantation increases, crystal nuclei become larger, the surface roughness increases, the surface hardness increases, and the friction coefficient increases, while comparative example 4 in which no surfactant is involved has a preferable surface roughness and surface hardness, but the friction coefficient shows an unstable characteristic, and may be a region in which the degree of dispersion is poor, the surface growth is uneven, and the growth is partially poor because no surfactant is involved. Nevertheless, the surface hardness and the friction performance of all samples are greatly improved compared with those of the pretreated base material.
Fig. 2(a) is a three-dimensional image of the surface of the sample, which is very uniform with only individual areas having a higher surface of the sample, and the friction coefficient map of fig. 3, which is short in the initial stage, is also confirmed from the side. FIG. 2(b-d) is an SEM image of the surface of an example sample, the surface of the example sample is very uniform and smooth when observed in a large range of 500 times, the surface of the example sample is observed to be 5000 times larger than that of the example sample, the surface of the example sample has micron particles with the size of about 1-2 microns, the surface of the example sample is five ten thousand times larger than that of the example sample, and the surface of the example sample has nano particles with the size of about 30 nm-100 nm, and the example sample shows good surface finish.
Fig. 3 and 4 show the friction coefficients of the examples and the comparative examples 1 to 4, which show that the friction process of the examples shows the best friction performance after a short break-in, while the comparative examples 1 to 3 show a slight decrease in friction performance as the size of the seeded particles increases, while the friction curve of the comparative example 4 shows a certain instability, which is represented by a low friction coefficient with fluctuation, which may be a region with partially uneven growth on the surface without the participation of surfactant relative to the examples, and nevertheless shows a relatively better overall performance than the comparative examples 1 to 3.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (12)
1. A preparation method of a diamond coating is characterized in that a plurality of suspensions of nano-scale diamond particles are prepared, the suspensions are sequentially used for carrying out crystal planting on the surface of a pretreated hard alloy substrate according to the order of the particle sizes of the nano-diamond particles from large to small, and then diamonds are grown through a microwave chemical vapor deposition method to obtain the diamond coating.
2. The method for preparing diamond coating according to claim 1, wherein 3 kinds of said nano-scale diamond particles are used in suspension, wherein the nano-scale diamond particles have a size of W0.25, W0.08 and W0.03 in order from large to small, and accordingly, the number of seeding times is 3.
3. The method of producing a diamond coating according to claim 2, wherein the suspension of nano-scale diamond particles comprises nano-scale diamond particles, acetone, and a surfactant; wherein the mass concentration of the scale diamond particles is 3g/100ml-6g/100ml, and the mass concentration of the surfactant is 0.02% -0.1%.
4. The method of preparing a diamond coating according to claim 3, wherein the surfactant is cetyltrimethylammonium bromide, which is used to wet and disperse each of the nano-scale diamond particles.
5. The method for preparing the diamond coating according to claim 1, wherein the process of crystal planting is as follows: placing the pretreated hard alloy matrix in the nano-scale diamond particle suspension for ultrasonic dispersion for 30-60 min; after the seeding, the residual nano-scale diamond particles are removed by sequentially cleaning the diamond particles with ethanol and acetone.
6. The method of preparing a diamond coating according to claim 1, wherein the pre-treatment comprises: cleaning the hard alloy matrix, performing Co removal treatment on the hard alloy matrix by an acid-base two-step method, and depositing a Ti transition layer on the surface of the hard alloy matrix by a magnetron sputtering method.
7. The method of preparing a diamond coating according to claim 6, wherein the cleaned cemented carbide substrate comprises at least one of: ultrasonic cleaning with ethanol for 15 minutes, cleaning with deionized water for 5 minutes, cleaning with acetone for 15 minutes, cleaning with deionized water for 5 minutes, and cleaning with deionized water for 15 minutes; after cleaning, the mixture is put into ethanol for standby.
8. The method for preparing the diamond coating according to claim 6, wherein the acid-base two-step Co removal treatment comprises: firstly, treating for 30 minutes by using an alkali solution, and then treating for 2-6 minutes by using an acid solution; the alkaline solution is a Murakami reagent, wherein the mass ratio of each component is K3Fe(CN)6:KOH:H2O1: 1: 10; the acid solution is a mixed acid, wherein the volume ratio of each component is H2SO4∶H2O2＝3:7。
9. The method for preparing a diamond coating according to claim 6, wherein the preparation parameters of the Ti transition layer are as follows: background vacuum degree of 1-3 multiplied by 10 < -6 > torr, power of 70W, room temperature sputtering, sputtering pressure of 8-9 mtorr and sputtering time of 4 hours; the Ti layer has a thickness of 400-500 nm.
10. The method for preparing a diamond coating according to any of claims 1-9, wherein the microwave chemical vapor deposition process has the process parameters: the deposition temperature is 700-800 ℃, the deposition pressure is 3-5 kPa, the reaction gas is hydrogen and methane, the concentration of the methane is 5-15%, the nucleation time is 0.5 hour, the deposition time is 4 hours, and the thickness of the obtained diamond coating is 3-4 mu m.
11. A diamond coating produced by the method for producing a diamond coating according to any one of claims 1 to 10.
12. A cemented carbide composite tool with a diamond coating comprising a cemented carbide substrate having a surface deposited with the diamond coating of claim 11.
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